That's from page 225 of the paperback edition, in the chapter The Andelainian Hills. It's Caer-Caveral speaking to Covenant about why it was good that Linden didn't enter Andelain. I think this sentence has to refer to Linden's parents, since she doesn't have any Dead from the Land itself, and her parents would obviously be very grim shades. Why else would he say this? Why would Linden raise grim shades, and not happy ones? The fact that he knows which kind she would raise points to the fact he must know which shades, specifically, she would raise. And Donaldson has already spelled out that you raise your own personal Dead when you go to Andelain. So it’s not really much a of leap to conclude that she would raise her own parents there."And the woman of your world would raise grim shades here."
If this is correct, dead from the real world can travel to or be invoked in the Land. This means that breaking the Law of Death in the Land has affected the meaning and consequences of death in the "real" world. Quite a major revelation from one sentence!
This is quite different from Linden or Covenant being able to travel to the Land. Just because Covenant (and Troy and Linden) could be summoned to the Land doesn’t imply anything at all about the barrier between life and death being broken so that dead people from TC’s “real” world could cross into it. Before breaking that Law, the Dead in the Land couldn’t even come back. So something new has indeed transpired.
This is what we’ve all been missing: breaking a Law in the Land has consequences in the real world (in this instance, dead from our world being able to cross over)! That’s huge! It's one thing for people from our world who are already in the Land to die there and have some kind of figurative, metaphorical existence (e.g. as a forestal, or as the Timewarden). But for a literal dead spirit from our world to be able to cross over commits Donaldson to a metaphysical stance on spirits/souls in the "real" world of TC and LA. That's unprecedented. Never before has he hinted that there is any literal life after death for the real world, much less one that can be invovled in the Land.
So let's follow this reasoning: if the Law of Death can have effects on the real world, what if the same could be said of the Law of Life applying to the real world?!? Would that be a way to bring everyone home, alive?
I think the Bane "is" Joan just as Foul "is" Covenant. And this metaphorical relationship becomes more literal in the next book. My reasoning for this is Donaldson saying (in AATE) that anyone who dies in the Land stays in the Land. They are usually transformed into a mythical archetype, like Hile Troy (Caer-Caveral) and Covenant (Timewarden). Joan is certainly unresolved, and Donaldson knew exactly what he was doing in making her confrontation so short.
